Threat Evasion for aws:multifactorAuthPresent condition using Cloudshell

Further Thinking

Brainstorming
  • Creating a lambda policy where ListFunctions and GetAccountSettings call need the user to have MFA enabled.
Lambda IAM policy
  • With the policy enforced, we can list out the lambda functions from the aws console
Listing lambda functions from aws console
  • When we try to list lambda functions using programmatic access we get an Access Denied.
Listing lambda functions from programmatic access

Attack Vector

  • Generating session tokens from cloudshell
Generating session tokens from cloudshell
  • Listing lambda functions with the session token generated earlier
Listing lambda function from session token assumed

Logging

CloudTrail logs
PutCredentials in cloudshell

Mitigation

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Falcnix

Falcnix

Application Security Engineer | Penetration Tester | NET+ | SEC+ | CEH | paWASP